Now, with a new easy to swallow coating. Frantic call for help, the mother and son plummeting to a sinkhole, trapped in their car. Here's ABC's Alex Perez outside Chicago tonight. Reporter: It happened in seconds before Juan knee Ta and her son could react, the roads swallowing their car with them in it. You can hear the panic as she franticly called 911. Hello? Please help. Reporter: They were out delivering newspapers, driving down a dark road in rural Illinois when their Ford tour us tumbled into the sinkhole. Mother and son were trapped. Benjamin was hurt. Then a bad situation got worse. A pick-up truck literally drives over them. Oh, my god, no! Another car! Okay, what just happened? I don't know. Another car just left. Reporter: That pick-up driver turns around. No, no, I just drove right overtop of you? Yes, you went over me. Oh, my god, oh, my god, are you okay? My son, I need help, my son, please. Reporter: With Benjamin injured and bleeding, patience grows thin. It felt like an hour to two hour, three hour wait. It felt like an eternity. Reporter: Benjamin has fractured ribs and cuts all over his body but is expected to make a full recovery. For his mom he says -- I'll stay strong. Even though it hurts so much you're going to stay strong for her? Yes. Reporter: Mother and son grateful to be alive after surviving a nightmare. Alex Perez, ABC news, Chicago.

This transcript has been automatically generated and may not be 100% accurate.

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